* Add configurable service proxy
* Fix service proxy URL used when opening scripts with a public base URL
When a public proxy URL was configured, the View link was falling through
to direct connection logic and opening the wrong URL. Move the public URL
early-return before connection-type checks, and remove the now-dead
duplicate check further down.
* Add service proxy documentation
Covers config options, URL generation format, wildcard DNS setup,
and reverse proxy Host header requirements.
* Cap combined public service label and document hostname format
* Address service proxy review feedback
